[RE-wrenches] Broken bolt

Ray ray at solarray.com
Tue Oct 2 11:20:03 EDT 2018


How many lugs were under the bolt?  It looks possibly like it didn't 
have enough threads into the shunt. I replace the bolt with a longer 
one, if I have more than one lug.  Also I use the thin lugs that come in 
Outback, Magnum, and Midnite equipment; I never use those super thick 
lugs that most electrical supplies have. They are way too thick and 
usually don't play well with shunt blocks or battery posts.  They also 
are not usually meant for the fine stranded cable usually used. Standard 
THHN in 4/0 puts way too much strain on bolts and hardware. I get UL 
listed thin lugs from Del City and Quick Cable, and use Cobra X Flex or 
the dual listed locomotive cable.  None of this may be your problem however.

Ray Walters
Remote Solar
303 505-8760

On 10/2/18 2:13 AM, Ron Young wrote:
> Anyone seen this before, the bolt on a shunt inside a Magnum inverter 
> snapped right off, other half inside the shunt. I was tightening it 
> but I don’t believe excessively. It appears to be crystallized. Magnum 
> is replacing the shunt but it’s my good luck that the job is 5 hours 
> into a remote backwater along a punishing road.
>
>
> Ron Young
> earthRight Solar - Solareagle.com <http://Solareagle.com>
>
>
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